---
title: "Timer 555 Calculator - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "This app is used to calculate monostable and astable circuit.  Features * Calculate pulse width of monostable circuit * Calculate frequency of astable circuit * Find out combination of components maki"
---

# Timer 555 Calculator — United States

![Timer 555 Calculator App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/98/5d/a9/985da9af-a18e-4600-1484-0e7876c99245/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png)

**Developer:** [Siu Yuen Ho](https://apptail.io/developer/siu-yuen-ho-Wqc)
**Category:** Utilities
**Rating:** 3.9/5 (8 ratings)
**Price:** Free
**Bundle ID:** com.peterhohsy.Timer-555-Calculator
**Store:** Apple App Store
**Country:** United States
**Version:** 3.0.20 (released 2025-05-14)
**Original Release:** 2014-03-06
**Languages:** English, French, German, Hindi, Italian, Japanese, Korean, Portuguese, Russian, Chinese, Spanish

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id834044557)
**AppTail Page:** [https://apptail.io/app/timer-555-calculator-knvd/united-states](https://apptail.io/app/timer-555-calculator-knvd/united-states)

## Timer 555 Calculator Description
This app is used to calculate monostable and astable circuit.

Features
* Calculate pulse width of monostable circuit
* Calculate frequency of astable circuit
* Find out combination of components making a desire pulse width in monostable circuit
* Find out combination of components making a desire frequency in astable circuit
* Saving component values in CSV file
* Upload generated CSV files via AirDrop or iCloud Drive
* Support English, German, French, Italian, Spanish, Portuguese, Japanese, Korean, Russian

## Timer 555 Calculator Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource125/v4/92/c2/11/92c2118f-4116-9003-c060-02f0dd6e4066/53d7d8e6-7e00-4fa1-94ab-0078b4c91a83_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_15.16.38.png/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource115/v4/ff/6d/ee/ff6dee11-fac2-aa11-4154-8c6319d65630/576319e7-6bba-4f80-a787-a229b5332250_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_15.16.55.png/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource125/v4/62/9f/ea/629fea9c-91dd-d9b4-274a-5a0f111d54d5/d946a511-723b-4a90-a86d-b747c52725ec_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_15.16.45.png/1284x2778.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource125/v4/66/b1/3c/66b13c2f-1bae-6153-7ef5-cd84bef33f40/e9a74ba2-90b1-47a6-bb69-99a7b338dd8a_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_15.17.10.png/1284x2778.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource115/v4/88/b9/89/88b989d0-d3c9-013d-4f62-db6c64a93aa4/990a28be-160d-4267-a3ab-af2524b60f5a_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_15.17.02.png/1284x2778.png)

## Timer 555 Calculator Rating Breakdown in United States
- 5 stars: 5 (63%)
- 4 stars: 1 (13%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 2 (25%)

## Timer 555 Calculator Reviews in United States

### ***** "Good app"
It was a very good app and easy to use and I have used it multiple times with no issues whatsoever.
-- pooface9300, 2018-07-26

### ***** "Good, simple"
Nice little 555 timer App. Great for most common 555 applications. It would be nice if other circuits found in books like the 555 Timer Cookbook would be included too.
-- phonebone222, 2015-01-08

### ***** "Excellent Tool"
This application is easy to use and very useful
-- photomem, 2014-10-14

[View all Timer 555 Calculator reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)

## Timer 555 Calculator In-App Purchases
| Item | Price |
|------|-------|
| Unlock Pro feature | $0.99 |


## Timer 555 Calculator Discovered Keywords
- 555 calc

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## Timer 555 Calculator Available In
- [United States](https://apptail.io/app/timer-555-calculator-knvd/united-states)
- [Russia](https://apptail.io/app/timer-555-calculator-knvd/russia)
- [Australia](https://apptail.io/app/timer-555-calculator-knvd/australia)
- [Germany](https://apptail.io/app/timer-555-calculator-knvd/germany)
- [Brazil](https://apptail.io/app/timer-555-calculator-knvd/brazil)
- [Colombia](https://apptail.io/app/timer-555-calculator-knvd/colombia)
- [Spain](https://apptail.io/app/timer-555-calculator-knvd/spain)
- [United Kingdom](https://apptail.io/app/timer-555-calculator-knvd/united-kingdom)
- [India](https://apptail.io/app/timer-555-calculator-knvd/india)
- [Thailand](https://apptail.io/app/timer-555-calculator-knvd/thailand)
- [Türkiye](https://apptail.io/app/timer-555-calculator-knvd/turkey)
- [Vietnam](https://apptail.io/app/timer-555-calculator-knvd/vietnam)
- [Algeria](https://apptail.io/app/timer-555-calculator-knvd/algeria)
- [Italy](https://apptail.io/app/timer-555-calculator-knvd/italy)
- [Japan](https://apptail.io/app/timer-555-calculator-knvd/japan)
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- [Portugal](https://apptail.io/app/timer-555-calculator-knvd/portugal)
- [Romania](https://apptail.io/app/timer-555-calculator-knvd/romania)
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- [New Zealand](https://apptail.io/app/timer-555-calculator-knvd/new-zealand)
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- [Philippines](https://apptail.io/app/timer-555-calculator-knvd/philippines)
- [Pakistan](https://apptail.io/app/timer-555-calculator-knvd/pakistan)
- [Poland](https://apptail.io/app/timer-555-calculator-knvd/poland)
- [Austria](https://apptail.io/app/timer-555-calculator-knvd/austria)
- [Saudi Arabia](https://apptail.io/app/timer-555-calculator-knvd/saudi-arabia)
- [Sweden](https://apptail.io/app/timer-555-calculator-knvd/sweden)
- [Azerbaijan](https://apptail.io/app/timer-555-calculator-knvd/azerbaijan)
- [Belgium](https://apptail.io/app/timer-555-calculator-knvd/belgium)
- [Bulgaria](https://apptail.io/app/timer-555-calculator-knvd/bulgaria)
- [Singapore](https://apptail.io/app/timer-555-calculator-knvd/singapore)
- [Belarus](https://apptail.io/app/timer-555-calculator-knvd/belarus)
- [Canada](https://apptail.io/app/timer-555-calculator-knvd/canada)
- [Switzerland](https://apptail.io/app/timer-555-calculator-knvd/switzerland)
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- [Czechia](https://apptail.io/app/timer-555-calculator-knvd/czechia)
- [United Arab Emirates](https://apptail.io/app/timer-555-calculator-knvd/united-arab-emirates)
- [Denmark](https://apptail.io/app/timer-555-calculator-knvd/denmark)
- [Dominican Republic](https://apptail.io/app/timer-555-calculator-knvd/dominican-republic)
- [Egypt](https://apptail.io/app/timer-555-calculator-knvd/egypt)
- [Finland](https://apptail.io/app/timer-555-calculator-knvd/finland)
- [France](https://apptail.io/app/timer-555-calculator-knvd/france)
- [Greece](https://apptail.io/app/timer-555-calculator-knvd/greece)
- [Hong Kong SAR China](https://apptail.io/app/timer-555-calculator-knvd/hong-kong)
- [Hungary](https://apptail.io/app/timer-555-calculator-knvd/hungary)

---

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